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/*
* BQ27xxx battery monitor I2C driver
*
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
* Andrew F. Davis <afd@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/unaligned.h>
#include <linux/power/bq27xxx_battery.h>
static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_mutex);
static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
{
struct bq27xxx_device_info *di = data;
bq27xxx_battery_update(di);
return IRQ_HANDLED;
}
static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
bool single)
{
struct i2c_client *client = to_i2c_client(di->dev);
struct i2c_msg msg[2];
unsigned char data[2];
int ret;
if (!client->adapter)
return -ENODEV;
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].buf = ®
msg[0].len = sizeof(reg);
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
msg[1].buf = data;
if (single)
msg[1].len = 1;
else
msg[1].len = 2;
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
if (ret < 0)
return ret;
if (!single)
ret = get_unaligned_le16(data);
else
ret = data[0];
return ret;
}
static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct bq27xxx_device_info *di;
int ret;
char *name;
int num;
/* Get new ID for the new battery device */
mutex_lock(&battery_mutex);
num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
mutex_unlock(&battery_mutex);
if (num < 0)
return num;
name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
if (!name)
goto err_mem;
di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
if (!di)
goto err_mem;
di->id = num;
di->dev = &client->dev;
di->chip = id->driver_data;
di->name = name;
di->bus.read = bq27xxx_battery_i2c_read;
ret = bq27xxx_battery_setup(di);
if (ret)
goto err_failed;
/* Schedule a polling after about 1 min */
schedule_delayed_work(&di->work, 60 * HZ);
i2c_set_clientdata(client, di);
if (client->irq) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, bq27xxx_battery_irq_handler_thread,
IRQF_ONESHOT,
di->name, di);
if (ret) {
dev_err(&client->dev,
"Unable to register IRQ %d error %d\n",
client->irq, ret);
return ret;
}
}
return 0;
err_mem:
ret = -ENOMEM;
err_failed:
mutex_lock(&battery_mutex);
idr_remove(&battery_id, num);
mutex_unlock(&battery_mutex);
return ret;
}
static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
{
struct bq27xxx_device_info *di = i2c_get_clientdata(client);
bq27xxx_battery_teardown(di);
mutex_lock(&battery_mutex);
idr_remove(&battery_id, di->id);
mutex_unlock(&battery_mutex);
return 0;
}
static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
{ "bq27200", BQ27000 },
{ "bq27210", BQ27010 },
{ "bq27500", BQ27500 },
{ "bq27510", BQ27500 },
{ "bq27520", BQ27500 },
{ "bq27530", BQ27530 },
{ "bq27531", BQ27530 },
{ "bq27541", BQ27541 },
{ "bq27542", BQ27541 },
{ "bq27546", BQ27541 },
{ "bq27742", BQ27541 },
{ "bq27545", BQ27545 },
{ "bq27421", BQ27421 },
{ "bq27425", BQ27421 },
{ "bq27441", BQ27421 },
{ "bq27621", BQ27421 },
{},
};
MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
#ifdef CONFIG_OF
static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
{ .compatible = "ti,bq27200" },
{ .compatible = "ti,bq27210" },
{ .compatible = "ti,bq27500" },
{ .compatible = "ti,bq27510" },
{ .compatible = "ti,bq27520" },
{ .compatible = "ti,bq27530" },
{ .compatible = "ti,bq27531" },
{ .compatible = "ti,bq27541" },
{ .compatible = "ti,bq27542" },
{ .compatible = "ti,bq27546" },
{ .compatible = "ti,bq27742" },
{ .compatible = "ti,bq27545" },
{ .compatible = "ti,bq27421" },
{ .compatible = "ti,bq27425" },
{ .compatible = "ti,bq27441" },
{ .compatible = "ti,bq27621" },
{},
};
MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
#endif
static struct i2c_driver bq27xxx_battery_i2c_driver = {
.driver = {
.name = "bq27xxx-battery",
.of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
},
.probe = bq27xxx_battery_i2c_probe,
.remove = bq27xxx_battery_i2c_remove,
.id_table = bq27xxx_i2c_id_table,
};
module_i2c_driver(bq27xxx_battery_i2c_driver);
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
MODULE_LICENSE("GPL");
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